spread a large spoonful or ladle of dosa batter on a hot tava or frying pan; add some oil and let the dosa cook for 1 - 2 minutes; now add the potato sabzi/masala; add the chopped vegetables; sprinkle the pav bhaji masala and salt; add some more oil or butter; with a potato masher mash the whole mixture well; cover the dosa from both sides or just from one side; flip and cook the dosa from both the sides. Serve mumbai mysore masala dosa hot with coconut chutney and veg sambar.